Convert the old logging "README" file to Doxygen format.  The opportunity
was taken to expand and edit it at the same time.

Both macros should be accepted, but CMSG_LEN appears not to work on
OpenBSD.

Rather than using terminal-specific hard-coded escape sequences that are
not guaranteed to work on all terminals, use the tput utility. Also use
the terminal defined standout mode rather than trying to set a specific
colour. The old way enabled bright yellow text which, while very visible
if your background is black, is all but invisible if your terminal
background is white.

Remerged to pick up changes for trac3241, that
were merged but not pushed.

Conflicts:
	ChangeLog

Adds DNS update request building to d2::NameAddTransaction.

Changed dhcp_ddns::NameChangeRequest to store lease address as
IOAddress only.  Corrected logic that handles request build
exceptions and added unit tests for same.  Other minor changes.

- eased language
- added link to system specific notes
- fixed coding guidelines link to look better
- added link to our build farm